Ball chair frame



FIG. 1 is a perspective view of a ball chair frame as seen from above according to our new design.

FIG. 2 is a perspective view thereof as seen from below.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a left side elevational view thereof.

FIG. 6 is a right side elevational view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view analogous to FIG. 1, and showing a ball on the ball chair frame in dashed lines during use.

The dashed lines throughout the drawings show environmental structure that form no part of the claimed design. 

CLAIM The ornamental design for a ball chair frame, as shown and described. 